Grinding machine



' March 21, 1933. F. G. HUGHES GRINDING MACHINE Filed Jlme 6, 1923 S m WW "M m mm P 60 ing tool and its attachingmeans.

Patented 21, 1933 i UNITED- srnres PATENT OFFICE rnnnnnrcx e. Rooms, 01- narsron, commcrrcur, assrenon 'ro 'rnn'nnw nnrm'mnn manoracrunme warm, or nnrsron, commcrrcur, a conronarron or con- NECTICU '1' Application filed June 8,

This invention relates to grinding mawith intervening ribs and a stationary iron disc or plate having cooperating ball grooves with intervening ribs. When one of these machines is continued in use, the

balls naturally wear down the grooves particularly 'on the comparatively soft a rading disc, so that, at frequent intervals, the unduly projecting ribs must be faceddown or dressed, so as not to interfere with grinding contact. -Hitherto, an effective dressin operation has required the disassembling o the machine and the carrying of the disc to some kind of resurfacing machine. The

parts are very heavy and cumbersome and the delay and interruption in the ball manufacturing operation is a source of expense and complaint.

An ob'ect of the invention therefore is to provi e a machine which will avoid the above noted and other objections as by resurfacing the abrading disc in its normal grinding position.

Another object of the invention is to provide a simple and efiective dressing device which can be easily attached to. existing grinders.

Still another object is to rovide an imroved dressin device whic will be read- 11y accessible or actuation and not interfere with the normal operation of the grinder on which it is used.

To these ends and also to improve general- ,ly upon devices of the character indicated my invention consists in the various matters hereinafter described and claimed.

Referring to the drawing, Figure 1 is a radial section through a portion of a ball grinder, showing the dresser attached. Fi re 2 is an end elevation of the -dress- 111 evice. 'gure 3 is a top plan view of the dressing device, and

igure 4 is a detail section of the ammo xacnnm 1923; Serial no. 648,784.

The numeral 10 designates a disc or plate to which is clam ed a ring or disc 12 of abrading materia having concentric ball grooves 14 with intervening ribs or lands 16.

he disc 10 is threaded on the end of a hollow spindle 18 which isdriven at high speed during the grinding operation. In axial -ali ent with the first rotary disc is a statlonary disc-or"plate 20 carrying a ring, plate or disc 22, preferably of cast iron. The ring 22 has a series of ball grooves 24 with intervening ribs cooperating with the similar ball grooves and ribs on the rotary disc.

Extending through the stationary disc, parallel to the axis of the rotary disc, is a series of shafts 26 which are arran ed preferably in a radial p ane, each sha t having a diameter approximately equal to the width of a rib and having its end face opposite to a rib of the rotary'disc. Each shaft can rotate and is also slidable to a limited extent there being fixed at the end of the shaft near the circumference, or at least eccentrically, a dressing tool 28, preferably a chip diamond. 'The diamond is carried substantially in the plane of the end face at the periphery. The pin 30 can be fixed 1n the desired adjusted position by a screw 34 threaded in the end of the shaft 26. Each shaft 26 is enlarged at one end and is rotatabl supported in a carrier 36, an integral co ar 38 on the shaft engaging one side of the carrier and a washer 40 fixed to the end of the shaft by a screw engaging the other side of the carrier.

Cut in the enlarged portions of the shafts are gear teeth 42 meshing withworms' 44 on a shaft 46 extending at right angles to the shafts 26 and at one side of them. Ahand wheel 48 at the end of shaft 46 is rotated to effect, through the gearing, rotation of the shafts 26. This causes the dressing tools 28 brought back to a tongue the ends of said shafts in alignment With the surfaces of the ribs on the disc 22 through I and illustrated by 3 means for rotating the shafts which they pass.

Although the invention has been described reference to a specific mechanism, it should be understood that, in its broader aspects, the invention is not necessarily limited to. the particular mechanism selected for illustration.

I claim:

1. In a machine comprising a rotary abrading' disc having ball grooves with intervening ribs and a stationary disc hav ng complemental ball grooves with intervemng ribs, the combination of a shaft extending through each of said last mentioned ribs b8- stationary member having cooperating and tween adjacent grooves and arranged to engage a rib on the rotary disc, a dressing tool ecoentrically carried by each shaft, and to resurface the'ribs, substantially as described. 2. In a machine comprising abrading disc havingball grooves with intervening ribs and a stationary disc cooperating with the rotary disc, the combination of a plurality of shafts extending through said stationary disc, means to effect an endwise adjustment of said shafts to cause them to engage the ribs on the rotary disc, a dressr abr ading disc having ing tool carried by each shaft, and means for rotatin -the shafts to resurface the ribs, substantially as described.

3. In a machine comprising a rotary ball grooves with intervening ribs'and a stationary disc cooperating with the rotary disc, the combination of a carrier attached to said stationary disc,

shafts journalled'in said carrier and extending through said stationary disc, a dressing tool carried by each shaft, and gearing on rotatin described.

stationary member,

4. In a machine comprising a rotary abrading disc having ball grooves with iner, the a carrier attached to said shafts journalledin said carrier and extending through said stationary member, a dressing tool on the end of combination of flange 56 on thea rotary through the stationary an intervening rib and a stationary the signature.

d 'ribs, substantially as described.

5., In a machine comprising arotary abrading disc having ball grooves with intervening ribs and a cooperating stationary member, the combination of a carrier attached to said stationary member, shafts journalled in said carrier and extending through said tools on the shafts, a shaft having gear gear teeth on the shafts, teeth meshing with the h gear teeth on the first mentioned shafts to rotate the latter, and means for adjusting the carrier to cause the dressin tools to come into engagementv with the rota disc, substantially as described.

6. n a grinding machine having a-gr'inder and means for rotating the grinder, a series of shafts extending parallel to the axis of the grinder and arranged in a radial plane, a dressing tool eccentrically mounted on the endof each shaft, and means for rotating the shafts to carry each dressing tool over a portion of the surface of the grinder, substantially as described.

. 7 In a machine comprising a rotary abrading member having concentric ball grooves with intervenin .ribs and a parallel uninterrupted ball grooves with intervening the rotary member without moving either member from grinding position and comprising rotaryv operating shafts extending member and the intervening ribs between the grooves to leave the grooves uninterrupted, a dressing tool mounted at the junction of the end face and periphery of each shaft, and means for rotating the shafts; substantially as described.

8. In a machine comprising a rotar abrading member having ball grooves wit member cooperating with the rotary member, a shaft extending through said stationary member and journalled on an axis parallel to the axis of the rotary member, diameter approximately equal to the width of the rib and having its end face opposite tool eccentrically carto. the rib, a dressing stationary member, dressingv ribs on the the shaft having a ried at the end face of the shaft, and means for rotating the shaft; substantially as described.

In testimony whereof I hereunto afiix my FREDERICK! G. HUGHES. I,

to cause the dressing tools to engage the ribs 

